Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9058a84d18cbf2c…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 16:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f40eec5fbb7ebff2222a9c51024a8f8 SHA-1: b190eeec5ddace31d1514e62bf9c39929dcd5d02 SHA-256: b9058a84d18cbf2cf76db3e87274f58b7376fe8154ab5c29b95c53a06932d5d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to manipulate search engine rankings. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicates maliciousness. The primary function appears to be redirecting users to potentially malicious content through a network of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.drivingschool-brno.cz/files/files/50192281389.pdf In PDF document text
    • http://hublihorse.com/uploads/userfiles/files/rusijuwuduxoregakawamomu.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/96647960222.pdfIn PDF document text
    • https://sentralperdana.com/file/66746580947.pdfIn PDF document text
    • http://anael.fr/fckeditor/userfiles/file/futenuwulijaburizuv.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/41520556040.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/b0ed868881497fc14a36afbc7a248e37/77237869643.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/jixosunike.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/52646025280.pdfIn PDF document text
    • https://myarchitect.es/ckfinder/userfiles/files/xaxemikemudag.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/webidewudowajogidavodurud.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614834322b1ec---biwobejodufipakomi.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/fujatimafekaw.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/pesusafugadabixuzazo.pdfIn PDF document text
    • http://360global.ca/userfiles/file/tujubesewelelosete.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/jebamewefilozu.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161319a8fb981f---nukaxojuzopes.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/kasurotejetiroxibeg.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16138d2ae0de7a---52414105774.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/7fc804tgh1hrb9g2i8tl3rkpsp/44969396449.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/65485548904.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/23124000376.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/43829885192.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161460970615a9---babuzapagusodilodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=aplikasi+yang+wajib+ada+di+hp+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA43 15584 bytes
SHA-256: acd4685dc1e0ef210293860edfe39f08e8492e357ecd255d721c0e8ed9750a76
font_01_sfnt_off00010226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10226 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3D 10984 bytes
SHA-256: 70dc30a72c22ce792325833ce6888f0507d5ea1569125a06e1f1afc6ab2495e7

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